Abstract：
:Charge order is universal among high-Tc cuprates, but its relation to superconductivity is unclear. While static order competes with superconductivity, dynamic order may be favorable and even contribute to Cooper pairing. Using time-resolved resonant soft x-ray scattering at a free-electron laser, we show that the charge order in prototypical La2-x Ba x CuO4 exhibits transverse fluctuations at picosecond time scales. These sub-millielectron volt excitations propagate by Brownian-like diffusion and have an energy scale remarkably close to the superconducting Tc. At sub-millielectron volt energy scales, the dynamics are governed by universal scaling laws defined by the propagation of topological defects. Our results show that charge order in La2-x Ba x CuO4 exhibits dynamics favorable to the in-plane superconducting tunneling and establish time-resolved x-rays as a means to study excitations at energy scales inaccessible to conventional scattering techniques.
journal_name
Sci Advjournal_title
Science advancesauthors
Mitrano M,Lee S,Husain AA,Delacretaz L,Zhu M,de la Peña Munoz G,Sun SX,Joe YI,Reid AH,Wandel SF,Coslovich G,Schlotter W,van Driel T,Schneeloch J,Gu GD,Hartnoll S,Goldenfeld N,Abbamonte Pdoi
10.1126/sciadv.aax3346subject
Has Abstractpub_date
2019-08-16 00:00:00pages
eaax3346issue
8issn
2375-2548pii
aax3346journal_volume
5pub_type
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